Bath Locks ( grid reference ST756643 ) are a series of locks situated on the Kennet and Avon Canal, at Bath, England. Bath Bottom Lock, which is numbered as No 7 on the canal is the meeting with the River Avon just south of Pulteney Bridge. Alongside the lock is a side pond and pumping station which pumps water up the locks to replace that used each time the lock is opened. The next stage of Bath Deep Lock is numbered 8/9 as two locks were combined when the canal was restored in 1976. A road constructed while the canal was in a state of disrepair passes over the original site of the lower lock. The new chamber has a depth of 19 feet 5 inches, making it Britain's second deepest canal lock. Just above the 'deep lock' is an area of water enabling the lock to refill and above this is Wash House Lock (number 10), and soon after by Abbey View Lock (number 11), a grade II listed building by which there is another pumping station and in quick succession Pulteney Lock (12) and Bath top Lock (13). Above the top lock the canal passes through Sydney Gardens where it passes through two tunnels and under two cast iron footbridges dating from 1800. Cleveland tunnel is 173 feet long and runs under Cleveland House, the former headquarters of the Kennet and Avon Canal Company. A trap-door in the tunnel roof was employed to exchange paperwork between clerks above and barges below. This is now a grade II* listed building. Many of the bridges over the canal are also listed buildings.